webpack.config.js

const webpack = require('webpack');
const path = require('path');
const CopyPlugin = require('copy-webpack-plugin');

const config = {
    mode: 'development',
    entry: {
        main: path.join(__dirname, 'src/index.tsx'),
        content: path.join(__dirname, 'src/content.ts'),
        background: path.join(__dirname, 'src/background.ts'),
    },
    output: { path: path.join(__dirname, 'build'), filename: '[name].js' },
    devtool: 'cheap-module-source-map',
    module: {
        rules: [
            {
                test: /\.(js|jsx)$/,
                use: 'babel-loader',
                exclude: /node_modules/,
            },
            {
                test: /\.css$/,
                use: ['style-loader', 'css-loader'],
                exclude: /\.module\.css$/,
            },
            {
                test: /\.ts(x)?$/,
                loader: 'ts-loader',
                exclude: /node_modules/,
            },
            {
                test: /\.css$/,
                use: [
                    'style-loader',
                    {
                        loader: 'css-loader',
                        options: {
                            importLoaders: 1,
                            modules: true,
                        },
                    },
                ],
                include: /\.module\.css$/,
            },
            {
                test: /\.svg$/,
                use: 'file-loader',
            },
            {
                test: /\.png$/,
                use: [
                    {
                        loader: 'url-loader',
                        options: {
                            mimetype: 'image/png',
                        },
                    },
                ],
            },
        ],
    },
    resolve: {
        extensions: ['.js', '.jsx', '.tsx', '.ts'],
        alias: {
            'react-dom': '@hot-loader/react-dom',
        },
    },
    devServer: {
        contentBase: './build',
    },
    plugins: [
        new CopyPlugin({
            patterns: [
                {
                    from: 'node_modules/webextension-polyfill/dist/browser-polyfill.min.js',
                    to: '.',
                },
                { from: 'public', to: '.' },
            ],
        }),
    ],
};

module.exports = config;